<template>
  <div class="count">
    <h1>当前求和为:{{sum}}</h1>
    <h3>当前求和放大10倍为:{{bigSum}}</h3>
    <h3>我在{{school}},学习{{subject}}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
import {mapState, mapGetters} from 'vuex'
export default {
  name: 'count-com',
  data() {
    return {
      n: 1,    // 用户选择的数字
    }
  },
  methods: {
    // 增加
    increment(){
      this.$store.commit('AddHandler', this.n)
    },
    // 减少
    decrement() {
      this.$store.commit('SubHandler', this.n)
    },
    // 奇数 增加
    incrementOdd() {
      this.$store.commit('OddHandler', this.n)
    },
    // 等待 增加
    incrementWait() {
      this.$store.dispatch('waitHandler', this.n)
    }
  },
  computed: {
    // 靠程序员自己亲自去写计算属性
    // sum(){
    //   return this.$store.state.sum
    // },
    // school(){
    //   return this.$store.state.school
    // },
    // subject(){
    //   return this.$store.state.subject
    // },


    //借助mapState生成计算属性,从state中读取数据.(对象写法)
    // ...mapState({sum:'sum',school:'school',subject:'subject'}),

    //借助mapState生成计算属性,从state中读取数据.(数组写法)
    ...mapState(['sum','school','subject']),


    /* ******************************************************************** */

    // bigSum(){
    //   return this.$store.getters.bigSum
    // },

    //借助mapGetters生成计算属性,从getters中读取数据.(对象写法)
    // ...mapGetters({bigSum:'bigSum'}),

    //借助mapGetters生成计算属性,从getters中读取数据.(数组写法)
    ...mapGetters(['bigSum'])

  },
  mounted() {
    const x = mapState({he:'sum',xuexiao:'school',xueke:'subject'})
    console.log(x)
  }
}
</script>

<style lang="sass">
$margin-left: 10px

button
  margin: $margin-left
</style>